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Question

The solubility product of a salt, having general formula MX2, in water is 4×1012. The concentration of M2+ ions in the aqueous solution of the salt (in terms of solubility) is:

A
2.0×106M
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B
1.0×104M
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C
1.6×104M
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D
4.0×1010M
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Solution

The correct option is C 1.0×104M
The ionization of MX2 is as shown below.
MX2M2++2X

The expression for the solubility product is, Ksp=[M2+][X]2.
But [M2+]=s and [X]=2s.
Ksp=4×1012.

Substitute values in the expression for the solubility product.

4×1012=s(2s)2=4s3=4×1012.

Hence, the solubility s=1.0×104M.

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